You need ways to sneak Tana past opposing blockers, but red has plenty of effects like Goblin Smuggler to help with that
Nevermore, from Innistrad, and its predecessor, Meddling Mage (from way back in Planeshift), are both great cards in tournaments, highly competitive, especially against combo decks that rely on specific cards
Interestingly the payoff for accumulating experience with Aang is a bit of a nonbo with the above
Traditional Foil Land replaces a Land in 20% of boosters.
If youre keen on making a rat typal deck, whether in Commander or another format, heres a look at the best rat cards in Magic
This will force you into a specific rotation , meaning you'll need to pay close attention to what you're doing for the most optimal setup, more so than some easier characters you can use